Air purifier



Jan. 30, 1945. E. E. BUSKIRK 2,368,343

AIR PURIFIER Filed Jan. 1 1942 2 Sheets-Sheet l JMUUIJUDAAAMUUUUA)A'IAJAJITUAM l 27 1 v Swim I I 4L Wififfijf/ff g Patented Jan. 30, 1945 UNITED STATES PATENT, OFFICE 1 AIR PURIFIER Elmore E. Buskirk, Adrian, Mich., assignor to uAget Manufacturing Company, Adrian,

a corporation of Michigan Mich.,

Application January 1, 1942, Serial No. 425,321

1 Claim.

Fig. 3 is a section on the lineIII-III; Fig. 1,

showing the housing unit;

Fig. 4 is a fragmentary'detail View of the device for mounting and removing the operating fixture from the power unit;

Fig. 5 is a, section on the line V-V, Fig. 3, of,

the fan chamber and parts' thereover in ,dis-

tributed relation;

Fig. dis a view of the rear of the device or unit; with parts broken away to show an additional feature of'a knocker to clear the filter;

Fig. '7 is a-view, with parts broken away, of an embodiment of the device as a bench fixture with the purifier or collector away from the tool;

Fig. 8 is a double end connection for the bench type of tool;

v Fig. 9 is a section on the line IX-IX, Fig. 8,

showing the hood adjacent the tool and connected to the duct;

Fig, 10 is a wiring diagram of the unit and the purifier; and

Fig. 11 is a fragmentary detail of a flexible collector connection'to a tool from the suction fan.

On a bench I is a. motor 2 having a. switch 3. The motor 2 has a shaft 4 upon which may be mounted a connection 5 for Carrying a tool 6.

Fixed With the housing of this motor 2 may be a threaded boss I (Fig. 4) about the shaft 4. On this threaded boss may be a nut 8 having a handle 9 to be rotated to travel away from the motor housing 2. The connection 5 and its tool 6 is thereby disconnected from the motor 2. There is thus provided ready means for mounting a cutting tool, grinding device, bufiing or polishing fixture, as may be appropriate say in connection with dental work undertaken, whether for denture of the plate type, or for special forming of 5 elements as teeth or fillings.

In the use of the present invention, this motor may have its shaft 4 located in proximity to an arc portion l0 (Fig. 3) of a hood ll having a base portion l2 in which may be located a removable tray [3. This hood is in proximity to a housing I I4 having 'an inlet IE to ainulti-blade fan I6 on -a shaft I! of a'motorl8 mounted on a deck IS in the housing. l4, spaced by i partition 20, from a fanchamber 2|.

About this inlet [5 to themulti-blade fan [6 extend yieldable, resilientspring arms 22 to engage peripherally a disk which constitutes a baiile. These arms 22 have overhanging free ends 24 notched to provideseatportio-ns 25. There is, accordingly, positioning of this disk or baffle in spaced relation from the opening I5 to provide a peripheral intake 26 of an area desirably greater than that of the intake port [5. This baffle 23 5 has'an ofisetupper portion 21 permitting the baffle as a unit to be removed from the spring arms 23 or placed againstthe intake [5, in'thereby cutting off effective draft operation of the fan 16. At' the position of normal placing of the b aille 23 in the spacing atthe seats 25 there isa uniform distribution of air intake about this disk in thereby adapting the forward central more quiet region for building up particles deposited thereonin the form of a cone 28. This accumulation tends to drop into the'tray 13. This tray l3 may save the fragments for reclaiming. In practicethis collection of the coarse or major portions in advance of the fan has run from to per cent of the substance removed.

From the chamber 2| having a scroll housing 29 (Fig. 5) there is spill by port 30 to a tray 3! which constitutes a precipitation chamber. The rectangular shallow chamber above the tray 3| has screen side wall or mesh sections 32, 33, in a rectangular frame 34 having a filter filler 35 of fibrous material such as fine spun glass. The filter 35 may be adapted to remove fumes or odors, thru the use of special material therefor, such as charcoal, or activated carbon. The housing M has a cap 36 over this filter with louver ports 31 directed away from the hood. The chamber 3| accumulates a volume of the fines. A secondary accumulation is in front of the baflle or in the tray I 3. There may be some deposit on the lower side of the filter. In fact, in remov which constitutes a light under the hood I I, thereby to illuminate the work exposed to the rotary tool 8. Simultaneously with this cutting in of th light 4|, this switch 38 cuts in connections 42 to operate the motor 18 to drive the fan. Indentations 43 with outer overhang portions 44 provide hand holds.

The housing I4 may be placed on the floor or away from the bench and at the intake there may be located a duct, say an elbow 45 (Fig'. 7) to a down pipe 46 having an L-connection 41 with the hood I l The duct 46 may have a branch 48 (Fig. *8) to an elbow 49 and a section 50 in communication by elbow 41 witha companion housing II. The filter housing may be extended upward to enlarge its capacity. a

A frame M has an upper chamber space with lateral or side louvers 52 (Fig. 2). Inward from the louvers 52 are filters 5|, 53, about a tray 3|. The addition of side-wall filters thus provides increased area for low velocity escape and etnc en separation of fragments, and a cordingly, due to aid increased area, there is less tendency to accumula e and obstruct the filter operation. This means a longer maintained efficient period of use.

Incre s d filter etficiency may be attained by the installation of a knocker device, herein shown a a crank shaft 54 protruding from the housing to have an operating handle 55 at one terminus 1 and an adjusting wing nut 46 on an opposite hreaded terminus 5'! for regulating the position of this knocker to oper te in so shaking the hiter that the fragments or particles removed from the air and lodged at such filter may be dropped therefrom into the tray 3 1.

According to the character of work in the use of the invention, the hood or housin H with its are opening portion In expose the tool less to the eye of the operator while he handles work at the tool. Accordin ly, a hinge 58 (Fig. 9) may mount a shield 59 which may be a transpa ency. With the shield freely swung, the hands or the operator on the tool may locate the position of the shield or the hinge 58 may be held in posisecondary deposit in the chamber 3|.

tion by friction so that the depending shield is retained in position as adjusted.

From the fan unit, in lieu of the elbow (Fig. '7) there may be a fitting of even the manifold type such as a flanged cap 60 (Fig. 11) having flexible ducts 6i therefrom to a hood or collector 62 about the tool 6. The particles to enter such passage way may be thrown off from work at a bufling or polishing jack, lathe, .or other operating tools.

The installation according to the invention is one permitting ready placing, or when placed,

use of the device in accumulating the particles which might contaminate the air. Furthermore, to the extent there be industrial values therein, such may be readily reclaimed. The coarser particles, by the draft in the hood, may be collected in advance of the fan due to the bafile 23. This low draft region may, to some extent, create a lower pressure or quiescent region effective for this deposit. Experience has shown that there may be this major accumulation on the baffle. The particles do not fiy outward from the chamher, bu insofar as not collected on the baflie 23, pass by the clearance 26 through the intake port l5 to the centrifugal or multi-blade fan l5 for The cleared air passes therefrom by the filter and out the louver ports 37. A felt strip 5| is arranged marginally as a packing against any seepage of particles from about the filter.

What is claimed and it is desired to secure b United States Letters Patent is: a

An air purifier unit embodying a suction fan of an endless annular series of blades forming an open ended cylinder, a housing for the fan providing an intake in cooperating proximity to the cylinder, a hood having an inlet opening of greater area. than the fanv intake, and a transverse bafile in the hood parallel to and spaced from the fan intake a sufiicient distance to provide a uniform entrance way thereabout as reat as the fan intake and on all sides of the bafile.

ELMORE E. BUSKIRK. 

